Ion Science MVI User Manual
Contents
1. Faringdon Oxfordshire SN7 7BU United Kingdom Tel 01367 241675 Fax 01367 242491 info shawcity co uk www shawcity co uk Part No 703 990 Page 20 of 202. MVI is calibrated in micrograms cubic metre ug m and will detect mercury vapour concentration in the range 0 2000 ug m The instrument is primarily used to monitor environments where mercury or its compounds are produced processed or stored and where mercury vapours may pose a health hazard to personnel A sample of the immediate atmosphere being monitored is drawn by pump into an absorption chamber where a selective ultraviolet light source is absorbed by the sample At the other end of the chamber a photodiode detector measures the intensity of radiation passing through the sample chamber The optical system is designed specifically to detect mercury which has a strong absorption line in the ultraviolet region of the spectrum The presence of mercury vapour will reduce the radiation energy reaching the photodiode detector in proportion to the vapour concentration This change affects a photodiode detector creating a change in signal that is detected and displayed on the meter as the mercury vapour concentration in micrograms cubic metre An audible alarm is offered which can give warnings at preset conditions Part No 703 990 Page 7 of 20 load A Specification Function Detector Measuring Ranges Sensitivity Repeatability Response Time Operating Range Battery Type Battery Life Dimensions Weight Linearity Zero Drift Part No 703 990 Surveying atmospheres for mercury Hg concentrati
3. 00 in this range the instrument will measure over a range of 0 200 ug m in steps of 0 1 uig m 4 Indicating Display This shows the mercury concentration in the monitored environment Range 0 2000 ug m Range2 0 200 ug m Note The display will also indicate LO BAT when batteries require charging Part No 703 990 Page 11 of 20 a Battery Charging ON Fooo orr a Charger Charging LED CHANGING E em OPERATING 1T Dwitoh to O te imbcooted ME hattorica D Move RANC 3 When Giepte contre to o Note A car veod if inn zeroed in aroa being 2d 4 For greater y move RANGE awitch When chargir CHARGING in ould glow MADE IN UK SHAWCITY LIMITED Charging Socket Part No 703 990 Page 12 of 20 gt Battery Charging The MVI incorporates a Ni Cad battery with a continuous duty cycle of 6 hours operation The charge cycle for the battery is 16 hours Recharging Switch the instrument off Connect the MVI battery charger to the instrument Use only the MVI charger Use of an alternative charger may damage the instrument and will void the warranty The green charging LED lamp located immediately below the ON OFF switch will light indicating the batteries are accepting charge If instrument is not regularly used then once a month it should be fully discharged by running it until the LO BAT appears The instrument must then be fully recharged for 16 hours Only store th
4. For Sales amp Service Contact lt a 00 2650 E 40th Ave Denver CO 80205 Phone 303 320 4764 Fax 303 322 7242 1 800 833 7958 www geotechenv com MV Mercury Vapour Indicator N B the MVI must not be used without the filter connected The instrument can be damaged without the filter fitted USER MANUAL Pioneer Road Faringdon Oxfordshire SN7 7BU United Kingdom Tel 01367 241675 Fax 01367 242491 info shawcity co uk www shawcity co uk Part No 703 990 Issue No 6 Warranty and Safety Notes Warranty The warranty period on this product is 12 months from date of sale We guarantee to repair or replace faulty goods supplied by Shawcity Limited or at our option to refund the purchase price subject to a claim being made in writing to us within 12 months after sale Any goods which are in subject of a guarantee claim must be returned to us Carriage paid and accompanied by the customer s advice note which should state the date of purchase of the goods in question and the nature of the fault Safety Notes Mercury amalgamates with gold silver stainless steel and copper alloys Accidental trapping of mercury can cause serious damage to vital parts of electronic equipment and delicate instruments Mercury is also toxic if inhaled ingested or absorbed through the skin or eyes Care must always be exercised when handling mercury The MVI contains a high voltage source and ultraviolet lamp Both of these it
5. d will provide warning of three separate conditions Condition Audible Signal 1 High mercury vapour concentration Slow pulse 1 sec 2 Negative reading more than 24 ug m Continuous tone 3 Low battery Fast pulse 3 sec The audible alarm is inhibited during the first 5 minutes of operation Part No 703 990 Page 9 of 20 Gaede Operating Controls Inlet Connector Display Zero Adlust On Off Switch SE ZEE Range Switch Charging LED Coe Df 5 5 Tips fais gm am p i i E hieren EM res Msj y LLL NT LB A gsr kA PS i mrama MITT a Par paan MAPCE mera c Vu nasci a er pee Lu LE T Dri a MITT LIMITED ye Recorder Output Charging Socket Part No 703 990 Page 10 of 20 Operating Controls The MVI indicating display and all operating controls are mounted on the front panel where they are readily accessible when the unit is held in the operating position 1 ON OFF charging switch is located immediately below the display and to the left In the ON position the MVI will operate and display In the OFF position power to the MVI is disconnected The instrument MUST also be switched OFF to enable charging 2 Zero Adjust knob at centre of panel between handle and display a ten turn potentiometer used to set the display to zero in mercury free atmosphere 3 Range Switch a 2000 in this range the instrument will measure over a range of 0 2000 ug m in steps of 1 ug m b 2
6. e unit in a fully charged state Part No 703 990 Page 13 of 20 lt gt MVI Display Low Battery Indication 199 Zero Setting LO BAT Part No 703 990 Page 14 of 20 Using the MVI 1 Position the instrument with controls facing up 2 Turn the instrument ON and ensure the LO BAT indication does not appear 3 Fit the Luer lock filter 4 Allow the instrument 10 minutes to warm up 5 Fit the charcoal filter in line 6 Adjust the zero control to indicate zero O00 on the display 7 Remove the charcoal filter 8 Fit PTFE probe and the MVI is now ready for use During use it may be necessary for steps 5 to 8 to be repeated N B the MVI must not be used without the Luer lock filter The instrument can be damaged without this filter After use switch instrument OFF and recharge the batteries Part No 703 990 Page 15 of 20 THIS PAGE IS LEFT INTENTIONALLY BLANK Part No 703 990 Page 16 of 20 anes E Interferences Since the mercury vapour detector depends on absorption of UV radiation by the sample it will be affected to some extent by any substance that has greater absorption of UV light than does normal air Some of the substances commonly encountered are vapour of various hydrocarbons water vapour sulohur compounds and particles such as smoke There is no measurable interference from CO COs or ammonia High concentrations of water vapour interference will give small r
7. eadings of approximately 3 to 6 ug M However if the instrument is zeroed at a similar humidity this will not be seen Table of some interferences at 100ppm concentration Compound Reading in ug M Benzene 20 Toluene 3 5 Acetone 3 Ethyl Alcohol 6 Ethyle Acetate 3 Changing Audible Alarm Level The mercury alarm level is factory set at 25 ug m If a different alarm level is required please contact the Factory for adjustment information Part No 703 990 Page 17 of 20 lt gt Maintenance 1 Charcoal Zero Filter Part No 150 173 The mercury zero filter will become saturated after extensive use It is therefore necessary to check the condition of the filter using the following procedure a Turn the instrument ON and ensure that the LO BAT indicator does not appear b Allow the instrument to warm up for 10 minutes Zero the instrument in fresh air c Connect the charcoal filter to the MVI The reading should not increase by more than 1 ug If the reading increases by more than 1 ug then the filter must be replaced 2 PTFE Probe and Filter assembly Part No 703 341 The MVI is supplied with a PTFE probe and Luer filter This can become contaminated or loaded with dust in regular use Typical symptoms of contamination are a sluggish response to mercury and an unstable zero If either of these symptoms occurs then the filter must be replaced Replacing the filter a Unlock the luer filter and discard r
8. ems are shielded inside the MVI to control the safety hazard DO NOT MODIFY SERVICE OR REPAIR THESE INSTRUMENTS WITHOUT CAREFUL REFERENCE TO THE SERVICE REPAIR MANUAL N B the MVI must not be used without the filter connected The instrument can be damaged without the filter fitted Part No 703 990 Page 2 of 20 reed ale Contents Page No Warranty and Safety Notes 2 Contents 3 Introduction 5 Specification 6 Description 7 Operating Controls 9 Battery Charging 11 Using the MVI 13 Interferences and Changing Audible Alarm Level 15 Maintenance 16 Spare Parts List 17 Calibration and Repair 18 Part No 703 990 Page 3 of 20 THIS PAGE IS LEFT INTENTIONALLY BLANK Part No 703 990 Page 4 of 20 a Front View CHARGING OPERATING 7 Dwitoh to O ie indicated Move RANC When diepte control to o Note A cer usod if inn JACTIONG nif LO BAT Dbetteres tko 2000 Hhust ZERO SIT ETETE should be zeroed in Oooo Foo RANGEL LT wo agus a AMIR tov EW uM lava Hike ee s ews nome eree boin 4 For greater RANGE switch When charging CHARGING in SHAWCIT Y LIMITED Part No 703 990 Page 5 of 20 THIS PAGE IS LEFT INTENTIONALLY BLANK Part No 703 990 Page 6 of 20 Introduction The Shawcity MVI Mercury Vapour Indicator is a highly sensitive instrument designed to detect minute concentrations of mercury vapour in the atmosphere The model
9. eplace with a new filter 3 Internal dust trap filter Part No 150 172 The MVI is supplied with an internal dust filter This can become contaminated or loaded with dust in regular use Typical symptoms of contamination are a sluggish response to mercury and an unstable zero f either of these symptoms occurs then the filter must be replaced Replacing the filter A Switch the MVI to the OFF position Remove the 4 case screws lift the case lid to reveal the internal filter which can be replaced by removing the tubing from both sides of the filter Part No 703 990 Page 18 of 20 lt gt Spare Parts List Description Part Number Zero Filter 150 173 PTFE Probe and pack of 10 filters 703 341 Manual 703 990 Set of Batteries 703 362 amp 703 363 Pump 150 175 230 VAC Charger UK 201 031 220 VAC Charger European 201 038 110 VAC Charger USA 201 033 Internal dust filter 150 172 Calibration and Repair The MVI requires annual calibration to maintain the best accuracy Shawcity Limited will calibrate the instrument against a near Primary Standard and issue a certificate of calibration If any calibration or repair work is required please return the instrument to The Service Department at Shawcity Ltd A written estimate will be provided for all work Pioneer Road Faringdon Oxfordshire SN7 7BU Tel 01367 241675 Fax 01367 242491 www shawcity co uk info Shawcity co uk Part No 703 990 Page 19 of 20 Pioneer Road
10. ons below and above the accepted exposure limit Ultraviolet photometer 0 2000 and 0 200 ug m dual range 0 1 ug m dual range 5 FSD Approximately 6 seconds 10 C to 40 C 15 Volt Ni Cad rechargeable More than 6 hours after full charge 145 x 295 x 80 mm 120 mm with handle 2 85 kg Better than 5 from 0 to 500 Lg m Less than 5 ug hour Page 8 of 20 gt Description The model MVI Mercury Vapour Indicator is a compact self contained and completely portable instrument which indicates the amounts of mercury in micrograms cubic metre The indicating digital display and carrying handle are mounted in the top cover A female luer connector is provided at the end of the instrument to accommodate a dust and water trap filter with PTFE extension probe In addition a length of flexible tubing may be connected to the filter for greater convenience when checking floor areas or gratings N B the MVI must not be used without the filter connected The instrument can be damaged without the filter fitted A voltage regulator fully compensates for changes in battery voltage A special integrated circuit amplifier provides temperature compensation The internal nickel cadmium battery is rechargeable from a plug in battery charger The operating time between charges is more than 6 hours Warm up time is about 10 minutes and direct readings are indicated on an easy to read LCD display The audible alarm when fitte
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